EP1012007A1 - Dispositif pour la protection des occupants dans un vehicule automobile et procede pour commander le gonflage d'un coussin gonflable dans un vehicule automobile - Google Patents

Dispositif pour la protection des occupants dans un vehicule automobile et procede pour commander le gonflage d'un coussin gonflable dans un vehicule automobile

Info

Publication number
EP1012007A1
EP1012007A1 EP98951175A EP98951175A EP1012007A1 EP 1012007 A1 EP1012007 A1 EP 1012007A1 EP 98951175 A EP98951175 A EP 98951175A EP 98951175 A EP98951175 A EP 98951175A EP 1012007 A1 EP1012007 A1 EP 1012007A1
Authority
EP
European Patent Office
Prior art keywords
occupant
belt length
gas bag
inflation
sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP98951175A
Other languages
German (de)
English (en)
Other versions
EP1012007B1 (fr
Inventor
Peter Popp
Ulrich Kippelt
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP1012007A1 publication Critical patent/EP1012007A1/fr
Application granted granted Critical
Publication of EP1012007B1 publication Critical patent/EP1012007B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/0153—Passenger detection systems using field detection presence sensors
    • B60R21/01534—Passenger detection systems using field detection presence sensors using electromagneticwaves, e.g. infrared
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/01516—Passenger detection systems using force or pressure sensing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/0153—Passenger detection systems using field detection presence sensors
    • B60R21/01536—Passenger detection systems using field detection presence sensors using ultrasonic waves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01554—Seat position sensors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01556—Child-seat detection systems
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/02—Occupant safety arrangements or fittings, e.g. crash pads
    • B60R21/16—Inflatable occupant restraints or confinements designed to inflate upon impact or impending impact, e.g. air bags
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R2021/01006—Mounting of electrical components in vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R21/00—Arrangements or fittings on vehicles for protecting or preventing injuries to occupants or pedestrians in case of accidents or other traffic risks
    • B60R21/01—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents
    • B60R21/015—Electrical circuits for triggering passive safety arrangements, e.g. airbags, safety belt tighteners, in case of vehicle accidents or impending vehicle accidents including means for detecting the presence or position of passengers, passenger seats or child seats, and the related safety parameters therefor, e.g. speed or timing of airbag inflation in relation to occupant position or seat belt use
    • B60R21/01512—Passenger detection systems
    • B60R21/01544—Passenger detection systems detecting seat belt parameters, e.g. length, tension or height-adjustment
    • B60R21/01548—Passenger detection systems detecting seat belt parameters, e.g. length, tension or height-adjustment sensing the amount of belt winded on retractor

Definitions

  • the invention relates to a device for occupant protection in a motor vehicle and a method for controlling the inflation of an airbag in a motor vehicle.
  • a device for recognizing the position of an occupant or an object on a vehicle seat is known from US Pat. No. 5,413,378.
  • the position of the occupant is determined by three ultrasonic sensors, which are located in the dashboard, in the backrest of the vehicle seat and on the side of the vehicle seat. zes are arranged and scan the space between the vehicle seat back and dashboard for an occupant or an object.
  • An evaluator determines the occupant position from the sensor signals.
  • each ultrasonic sensor must have a range of approximately one meter.
  • this relatively large range requires a relatively low resolution, so that distances can only be determined in a relatively coarse grid.
  • a fine resolution in the distance measurement is required.
  • the attachment of an ultrasonic sensor in the backrest of the vehicle seat is complex since a passage opening through the backrest cover is required. Such an arrangement of the sensor also affects seating comfort.
  • the object of the invention is therefore to provide a device for occupant protection in a motor vehicle and a method for controlling the inflation of an airbag, in which the disadvantages of the known device are avoided and which achieve a high resolution, in particular with simple and inexpensive production.
  • the part of the object of the invention relating to the device is solved by the features of claim 1.
  • the part of the object of the invention relating to the method is solved by the features of claim 9.
  • a sensor is provided that detects the presence of an object or an occupant in a danger zone in front of the gas bag.
  • the airbag unfolds when inflated into the space between the steering wheel or dashboard and the occupant.
  • the space that the gas bag fills up after being inflated also represents a danger area for the occupant at the time of inflation. If the occupant with one part of the body is in this danger area at the time of inflation, the risk of injury from the inflating gas bag is considerable.
  • the sensor which is designed in particular as a distance sensor, only or at least the danger area directly in front of the gas bag device is detected, that is to say the area into which the gas bag will deploy in the event of an impact. Due to the relatively short range that such a sensor must have to detect the danger zone - in particular less than 40 cm, if the sensor is arranged, for example, on the dashboard - the scanning accuracy is increased, in particular since the algorithm for processing the determined distance can be simplified and therefore more computing power is available for distance determination at a higher sampling rate. Furthermore, a sensor for the unrolled belt length - hereinafter referred to as belt length - of a belt device assigned to the vehicle seat is provided.
  • the unrolled belt length and, in particular, the change in belt length over time is a measure of the upper body position of the occupant in the vehicle seat.
  • An evaluator controls the inflation of the gas bag depending on the determined distance and the determined belt length.
  • the evaluator usually hits depending on an impact detection device - for example in the form of an acceleration gungssensors - the decision that the gas bag is inflated due to the impact to protect the occupant.
  • the evaluator influences this decision by determining the extent to which the gas bag is inflated, depending on the length of the belt unrolled and whether an object or an occupant is detected in the danger zone, and it is also possible to prevent inflation.
  • the advantage of the device according to the invention is that the occupant position is recognized with high resolution. Precisely due to the resolution-sensitive, relatively weakly radiating distance sensor and the design of the further sensor for determining the distance between the occupant and the vehicle seat back as a sensor for the unrolled belt length, a device with a high resolution for the determined occupant position can be arranged with little effort. These two sensors alone distinguish not only a normal seated occupant leaning against the backrest from an occupant advancing towards the dashboard, but also an occupant reading a newspaper, for example, in a normal sitting position. In addition, no mechanical intervention in the vehicle seat is required. Furthermore, the radiation load for the occupant is greatly reduced. Nevertheless, all the information necessary for the occupant position and in particular the differentiation of different occupant positions is provided.
  • Figure 1 shows schematically an interior of a motor vehicle with the device according to the invention
  • Figure 2 is a flowchart for an evaluation method in the evaluator of the device according to the invention.
  • FIG. 1 shows a passenger compartment 8 in which a vehicle seat 81 with a vehicle seat back 811 and a vehicle seat fuselage 812 is slidably mounted on a rail 821 connected to the vehicle floor 82, via a seat rail 813 connected to the vehicle seat fuselage 812.
  • a belt device 0 is fastened to the B-pillar of the motor vehicle with a belt strap 01 wound on a reel, which is unrolled when the belt is put on.
  • a fastener part of the webbing 01, not shown, together with a buckle 03 forms a lock when the seat belt is fastened.
  • a sensor 02 is provided for the unrolled belt length GUR.
  • a sensor 2 for the position of the vehicle seat is provided on the seat rail 813. This sensor 2 determines the vehicle seat position P along the axis shown.
  • the vehicle seat 81 also contains a device for weight or child seat recognition 1, which supplies the status signals GEW or KISI depending on a weight arranged on the vehicle seat 81 or a recognized child seat.
  • an airbag device 4 containing a folded gas bag 41, a gas generator 42 and a bracket 43 are arranged.
  • a distance sensor 3 is arranged on the gas bag cover 91, which scans the danger area shown in dashed lines in front of the gas bag 41 in a single beam and detects an object or an occupant in this danger area when the distance ABS recorded is less than the maximum range RWMAX.
  • An evaluator 5 arranged in the vehicle seat 81 evaluates the distance ABS of the distance sensor 3, the unrolled belt length GUR of the sensor for the unrolled belt length 02, the status signals GEW or KISI of the device for weight or child seat detection 1 and the vehicle seat position P of the sensor for the vehicle seat position 2 out.
  • the change in belt length within a predetermined period of time is determined in particular by forming the difference between a previously determined unrolled belt length and the currently determined unrolled belt length.
  • the position of an occupant or an object is recognized on the basis of the distance ABS and the belt length GUR or belt length change.
  • a first status signal STA1 is preferably output by the evaluator 5 to a control circuit 7 for triggering the gas bag 41 if the device for weight detection 1 supplies a weight signal GEW which indicates the presence of an occupant on the vehicle seat 81 - the weight signal GEW in particular is greater than a predefined threshold value, the rolled belt length GUR falls below a relatively low limit value and at the same time the distance sensor 3 is not an object or an occupant recognizes in its scope. All of these sensor signals indicate the presence of a vehicle occupant on the vehicle seat 81 in a normal, reclined sitting position. If an impact detection device 6 detects an impact which is sufficiently strong to trigger the gas bag 41 and therefore supplies a trigger signal OFF to the control circuit 7, the control circuit 7 generates an ignition signal Z, provided that the first status signal STA1 is detected at the same time.
  • a second status signal STA2 which differs from the first status signal STA1 is supplied by the evaluator 5 to the control circuit 7.
  • This second status signal STA2 identifies an occupant positioned very far forward, who is at least with some of his body parts in the danger zone of the gas bag 41.
  • the control circuit 7 prevents the ignition signal Z from being generated, since the risk of injury to the occupant is greater than the protection achieved by the gas bag in such an occupant position.
  • the airbag 41 can be triggered in several stages, for example the airbag 41 can be inflated to different volume levels by controlling a number of gas generators 42 assigned to the airbag 41, alternatively only a first stage of the airbag 41 can be inflated is inflated via an associated gas generator 42 with an ignition signal Z 1 # which differs from ignition signals Z ⁇ for further gas generators 42.
  • the filling volume of the gas bag 41 is then dimensioned such that when the distance ABS of the occupant in front of the gas bag cover 91 is recognized, there is no danger to the occupant from the inflation of the first stage.
  • the evaluator 5 delivers a third status signal STA3 to the control circuit 7.
  • This third control signal STA3 identifies in particular a newspaper-reading rear-leaned occupant.
  • the control circuit 7 preferably triggers a middle stage of a multi-stage gas bag in order to provide the occupant with a minimum level of protection, but on the other hand to do justice to the occupant situation and / or position in the passenger compartment which cannot be clearly predefined.
  • the vehicle seat position P of the sensor for the position of the vehicle seat 2 is also taken into account in the evaluator 5 for the assessment of the current occupant position.
  • a further status signal is preferably supplied by the evaluator 5 to the control circuit 7 when the device device for weight and / or child seat recognition 1 detects a child seat arranged on the vehicle seat 81.
  • the belt length GUR is then preferably not taken into account and only the distance ABS is checked: If the distance sensor 3 detects an object in its sphere of action, the child seat is directed backwards, that is to say with its backrest facing the fitting device 9. In the case of such an object position, the gas bag 41 is prevented from being triggered by the control circuit 7 due to the great risk of injury to the child.
  • the distance sensor 3 is preferably designed as an infrared sensor. It contains an infrared transmitter that emits infrared light with a maximum range RWMAX according to FIG. 1. An occupant or object staying in the effective area of the distance sensor 3 determined by the maximum range RWMAX reflects the infrared radiation, which is then recorded with photodetectors of the distance sensor 3.
  • the evaluator 5 can draw conclusions about the distance between the sensor and the detected object, for example, based on the running time between the emitted and received infrared signal.
  • the distance sensor can also work according to other physical principles, for example emitting ultrasound.
  • the arrangement of the distance sensor is not limited to the gas bag cover 91 or the valve device 9.
  • the distance sensor 3 can also be arranged on the vehicle headlining, even with such an arrangement only the so-called danger zone in front of the gas bag is detected.
  • the maxi- Male range RWMAX of the distance sensor thus relates to the extent of the danger zone between the gas bag device and a potential object or occupant on the vehicle seat, but not necessarily to the absolute range of the sensor radiation.
  • the distance sensor can, in particular, determine the desired distance in a single beam or scan a region with multiple beams, for example a sector shown in broken lines in FIG. 1, by a larger number of radiation emitters and radiation detectors.
  • the belt device 0 can be arranged not only on the B-pillar but also on the vehicle seat 81 itself.
  • Various physical principles for length measurement are available for determining the unrolled belt length GUR, especially with the aid of optical measuring equipment.
  • Weight detection 1 can be carried out in particular with the aid of a sensor mat which changes its resistance as a function of weight.
  • the device for child seat recognition 1 preferably emits an electromagnetic measuring field, which is changed in a characteristic manner by resonators in a child seat.
  • Evaluator 5 and control circuit 7 can in particular be implemented by a common microprocessor, which is arranged either in the vehicle seat 81 or on the vehicle tunnel or in the dashboard area.
  • the impact detection device 6 with its acceleration sensors is also preferred arranged in a common control unit together with the control circuit 7 and the evaluator 5.
  • FIG. 2 shows an example of a method running in the evaluator 5 for determining the status signals STA.
  • the distance ABS supplied by the sensor 3 for the danger zone and stored in a memory of the evaluator 5 is read out in step S1, in step S1 the unrolled belt length GUR likewise stored in the memory.
  • the second status signal STA2 is emitted by the evaluator 5 in step S4 and then a new cycle is started with step SO. The person is most likely sitting close to the dashboard, so that the gas bag is prevented from inflating in response to the status signal S2.
  • step S3 if the query in step S3 is answered in the negative and it is determined in step S5 that the belt length GUR is small and that no object or occupant is detected in the danger zone, the first status signal STA1 is emitted by the evaluator 5 - the person is sitting up normally the vehicle seat - before new values are read in with step SO. If the query in step S5 is answered in the negative and it is found in step S7 that both the distance to the backrest is small and that an object or occupant is detected in the danger zone, the status signal STA3 is delivered to the control circuit 7 in step S8 - the person is seated normal, but it's a bit close to the dashboard - before reading from step SO again. If the query in step S7 is negated, a status signal STA4 is sent to the control circuit in step S9 transmitted with the content 'There is an undetermined state' before proceeding to step SO.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Air Bags (AREA)

Abstract

Ce dispositif comporte un coussin gonflable (41) pour la protection d'un occupant sur un siège de véhicule (81), un capteur (3) détectant la présence d'un objet ou d'un occupant dans une zone de danger dans laquelle le coussin gonflable (41) se déploie en se gonflant, et un capteur (02) détectant la longueur de ceinture (GUR) déroulée d'un système de ceinture (0) associé au siège de véhicule (81). Un système d'évaluation (5) commande le gonflage du coussin gonflable (41) en fonction de la détection d'un objet ou d'un occupant dans la zone de danger et en fonction de la longueur de ceinture (GUR) déterminée.
EP98951175A 1997-09-09 1998-08-20 Dispositif pour la protection des occupants dans un vehicule automobile et procede pour commander le gonflage d'un coussin gonflable dans un vehicule automobile Expired - Lifetime EP1012007B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19739497 1997-09-09
DE19739497 1997-09-09
PCT/DE1998/002430 WO1999012778A1 (fr) 1997-09-09 1998-08-20 Dispositif pour la protection des occupants dans un vehicule automobile et procede pour commander le gonflage d'un coussin gonflable dans un vehicule automobile

Publications (2)

Publication Number Publication Date
EP1012007A1 true EP1012007A1 (fr) 2000-06-28
EP1012007B1 EP1012007B1 (fr) 2002-02-13

Family

ID=7841727

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98951175A Expired - Lifetime EP1012007B1 (fr) 1997-09-09 1998-08-20 Dispositif pour la protection des occupants dans un vehicule automobile et procede pour commander le gonflage d'un coussin gonflable dans un vehicule automobile

Country Status (6)

Country Link
US (1) US6443488B1 (fr)
EP (1) EP1012007B1 (fr)
JP (1) JP3728397B2 (fr)
KR (1) KR100370808B1 (fr)
DE (1) DE59803084D1 (fr)
WO (1) WO1999012778A1 (fr)

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JP2001515817A (ja) 2001-09-25
KR100370808B1 (ko) 2003-02-05
JP3728397B2 (ja) 2005-12-21
US6443488B1 (en) 2002-09-03
DE59803084D1 (de) 2002-03-21
WO1999012778A1 (fr) 1999-03-18
EP1012007B1 (fr) 2002-02-13
KR20010023813A (ko) 2001-03-26

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